Ultrasonic extraction
Use roughly 75% alcohol (such as vodka) and 25% water
Use an ultrasonic cleaning machine with a stainless steel vessel
Set the temperature to 105F or 41C.
Use 280 mL of extraction solution for every 10 grams of pine needles, or any other herb
Presoak for. 24 hours
Use a duration of 25 minutes for the ultrasonic extraction repeat 2-3 times after cool off
Store in tight glass containers.
Enjoy.